function mainchgn(ii66,val)
	{ 
	if(document.getElementById(ii66+val).style.display!="none"){
		   document.getElementById(ii66+val).style.display="none";
		   return;
		}
	  var i=0
		while(document.getElementById(ii66+i))
        {
		   document.getElementById(ii66+i).style.display="none";
		   i++;
		}

		   document.getElementById(ii66+val).style.display="";
	}